main {
  width: 1020px;
  height: 100vh;
  border: solid 1px black;
  margin: 0 auto;
}
main article {
  width: 750px;
  height: 300px;
  background-color: red;
  float: left;
}
main aside {
  width: 200px;
  height: 300px;
  background: green;
  float: right;
}
